Python script to parse certificate data from Terraform output

grokcerts.py

#!/usr/bin/env python3
#
# Reads certificate information from Terraform output and creates certificate
# files ready for use.
#
# If Terraform variable for certificates is defined like:
#
#   variable certificates {
#     type = map(string)
#     default = {}
#   }
#
# And the output is defined like:
#
#   output "certificates" {
#     description = "Certificate details"
#     value       = {
#       for name, domain in var.certificates:
#       name => {
#         certificate = acme_certificate.certificate[name].certificate_pem
#         issuer      = acme_certificate.certificate[name].issuer_pem
#         key         = acme_certificate.certificate[name].private_key_pem
#         url         = acme_certificate.certificate[name].certificate_url
#       }
#     }
#     sensitive = true
#   }
#
# use like: terraform output -json certificates | grokcerts.py

import sys
import json

data_json = "".join(sys.stdin.readlines())
data = json.loads(data_json)

for domain in data.keys():
  print(domain)

  # this is clumsy AF but it works
  issuer = data[domain]['issuer'].split('-----END CERTIFICATE-----')[0] + '-----END CERTIFICATE-----'

  with open(f"{domain}.key", "w") as fh:
    fh.write(data[domain]['key'])

  with open(f"{domain}.crt", "w") as fh:
    fh.write(data[domain]['certificate'])
    fh.write(issuer)